Telephone-receiver.



T. RHODUSt TELEPHONE RECEIVEP.l APPLICATION meny FEB. 15, m5.

www2, Patented Dec. 28, 1915.

SHEETS-SHEET 2.

- switching THOMAS RHODUS, OF CHICAGO, ILLINOIS, ASSIGNOR T0 THE MAGNIPI-IONE COMPANY, A CORPORATION OF ARIZONA.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented Dec. 2%. i915.

Application filed February 15, 1915. Serial No. 8,194.

Be it known that l, THOMAS RHoDUs, a citiyen of the United States of America, and a resident of Chicago, in the county of (look and State' of Illinois, have invented certain new and useful Improvements in '.lclcphone-Receivers, of. which the follow'- ing is a specification.

This invention relates more particularly to that type of telephone receivers having a compact, flat and light structural adapta-v tion of parts, whereby the same can be supported in proximity to the ear of the user in a ready and convenient manner.

And the present improvement has for its various objects: 1. To provide a light and efficient formation and arrangement of parts of the electro-magnetic member of the receiver adapted to afford a simple and compact association with the inclosing' shell or casing with an ample yet compact structure of the helix or winding or insulated wire of said electro-magnetic member. 2. To provide a simple, efiicient and convenient formation and arrangement of terminal plates of the receiver', whereby said plates are adapted "for ready connection with the line wire terminals, with the switch of the re ceiver and with the respective ends of the energizing coil or helixof the electro-magnetic member, without encroachment upon the central sound cavity of the receiver. 3. To provide a simple and efficient construction of local switch within the receiver, adapted to aii'ord a ready and effective function without encroaching upon the central cavity of the receiver. 4. To provide an efficient formation and adaptation of the central adjustable pole piece of the elect1'"o-magnetic member of the receiver, adapting this same for ready attach-` ment to a' supporting head band or yokef without interference with the manual adjustment of said pole piece. 5. To provide an efficient arrangement and combination of parts, in which the manual adjustment of the` central pole piece or core of the electro- 'magnetic member 'of the Areceiver can be readily effected,1 and withv which said pole piece or core is held from independent local vibration or movement in its support; all as will hereinafter more fully appear.

In the accompanying drawings: Figure 1, is an elevation of the present telephone re ceiver, the ear piece or cap and the diaphragm being removed. Fig. 2, is a transverse section on line @v -:0, Fig. l. Fig. 3, is a detail transverse section on line mwm, Fig. 1. Fig. 4c, is a detail sectional view on line .r2-422, Fig. 3. Fig. 5, is a detail transverse section on line ac3-x3, Fig. 1. Fig. 6, is a detail perspective view of an end portion of the supporting head band or yoke by which the receiver is supported in proximity to the ear of the user. Fig. 7, is a perspective view of the parts in a detached condition.

Similaireference numerals indicate like parts in the several views.

Referring.. to the drawings, 1 represents the containing shell or housing of the receiver, and comprising a bottom web 2, and an annular wall ,3, the upper end of which is externally screw-threaded for engagement with acorrespondingly formed marginal rim ofrthe cap ,or ear piece 4: of the receiver. Inv the construction shown the aforesaid bottom web 2 is formed with a central orifice 5 for the passage of the adjusting end of the hereinafter described central core or pole piece of the electro-mag netic member of the receiver, and with a pair of interior ledges or posts 6, for the attachmentof saidelectro-magnetic mem ber and its accessories.

7 designates the diaphragm of iron or other suitable material, and held in place in any suitable manner, usually by its marginal portion engaged between the top rim of the wall 3 of the receiver housing and a companion annular rib 8 in the interior of the cap or ear piece 4, aforesaid.

9wdesignates the base plate or piece. of the electro-magnetic member, formed preferably,of a fiat disk of metal provided with peripheral attaching ears or lugs 10, and with a central screw-threaded orifice for holding engagement with a correspondingly formed portion of the adjustable central core or pole pi'ce hereinafter described.

11 designates the annular or outer pole piece of the above mentioned electro-magnetic member, and comprising a narrow marginal rim 12, having attaching ears or lugs 13 corresponding with the ears or lugs 10, of the base piece 9, aforesaid, and a cone-shaped inner web 14 having a central orifice for the reception of one end of the yhereinafter described spool or bobbin upon which is wound the coil or helix of the electro-magnetic memjustment of the same or helix pass, as hereinafter more fully dey scribed.

16 designates th` spool or bobbin above'referred to, having a length corresponding with the distance between the aforesaid base plate 9 and the remoteportion of the inner web 14, as shown. In its preferred form Shown in Fig. 2, the spool or bobbin 16 has an outer rim 17 of a small diameter` fitting the central orifice of the aforesaid annular pole piece 11, and with an inner. rim 18 of a large diameter and resting against and secured to the base piece 9, aforesaid. As so formed the spool or bobbin is adapted to hold the conically wound energizing coil or helix 19 of the electro-magnetic member, and provide a maximum length and energizing efficiency in said coil or helix.

20 designates the cylindrical central core or pole piece of the electro-magnetic member, extending through the axial bore of the spool or bobbin 1G, aforesaid. Said pole piece 20 is formed with a threaded-portion 2l'intermediate of its length for operative engagement with the screw-tln'eadcd central orifice of the base plate 9 aforesaid, and with a reduced neck extending from said portion 21, and carrying an operating head or handle 22, which in the present improvement'is formed with a peripherally groovedV collar 23 adapted for holding engagement with a receiving orifice 24, of a l ey-hole form, in the end of a holding band 25 of an ordinary head gear by which the receiver is held in Aposition adjacent to the ear of the user. The described construction is adapted to permit of the ready manual turning of the pole piece 20, in effecting the usual adto and from the diaphragm 7, to vary the degree of vibration of the same as usual in the present class of telephone receivers.

26 designates a coiled spring surrounding the reduced neck of the pole piece 20, and

' interposed between the base plate 9 and collar 23, before described. The purpose of the spring is to exert a yielding longitudinal stress upon the -pole piece 20 and hold its screw-threaded portion 21 in close contact with the screw-threads of the central orifice f the base plate 9 aforesaid.

V27 and 28 designate the pair of terminal plates of the receiver. In the present construction said plates are of the segmental or lcurved form shown in Figs. 1 and 7 and secured in an insulated manner upon the marginal ears 13 of the annular pole piece 11, by screws 29. and an' interposed plate 30 of vinsulating material and of a curved shape corresponding with that of `theterminal plates 27, 28,'aforesaid. The screws 29 pass down through the marginal ears 13, aforesaid, and screw into the companion ears 10 of the base plate 9, and are adapted to hold the various parts in an assembled condition.

31 designates an attaching screw passing down through the middle portion of the terminal plate 27 and the insulating plate 30 and screwing into one of the ledges 6 of the housing l, to form a part of the detachable connection between said housing 1 and the electro-magnetic member and its accessories above described.

32 designates a companion attaching screw, which in this instance is of the ordinary insulated type, and passes between ad- Vjacent ends of the terminal plates 27, 23, and

screws into the other ledge (5 of the housing l, to constitutethe other part of the detachable connection above described in connection with`the attaching screw 31.

`33 and 3l .designate tubular eyes or enlai-gements formed on the adjacent ends of the terminal plates 27, 28,- opposite to the adjacent ends above mentioned, and adapted to 'receive the terminal plugs or pins 35 of the live wires. In the preferred form of thc present invention the terminal vplate 27, aforesaid, is formed in two portions or sections, arranged in spaced and insulated re lation, with the end of one section having a curved formation 3G, as shown on Figs. 5 and 7, to constitute a spring -contact bearing .for the point of the switch member, now to" be described.

37 designates an approximately semi-circular switch member of a plate form, pivoted at one end to a stationary'post 38 disposed between the pair of tubular eyes 33, 34, aforesaid. Sayid switch member extends around over one section of the terminal plate 27 into adjacent relation to the curved end formation 36,' of the other section of said.

terminal plate 27, and adapted to he manually moved into electrical contact therewith when required. Near its free end. the switch member 37, is deflected downwardly to be in electrical contact with the'section of the terminal plate 27 first above mentioned, and is provided witha lateral handle 39,' extending through a slotin the'cylindric'al wall 3 of the housing 1 for convenient manual operation.

40 designates a -knob or rib formed on the' terminal plate 27 and disposed in advance of the contact end of the switch member 37, andv adapted to provide a barrier against free or accidental shifting of the switch member from the position at which it may be placed. l

41 and 42 designate conducting wires extending from the terminal plates 27, 28,

through the insulating bushings 15 of the annular pole piece 11 and connecting the respective ends of the coil or helix 19 with said terminal plates.

ideama Having thus fully described my said invention What l claim asfnew and desire to secure by Letters Ratenhisz-f t l. In ay telephonlfi'receiver, the 'combination vof a housing, a diaphragm carried lby said housing, an `electro-magnetic member comprising a central pole piece, an energizing. coil surrounding said pole piece, a base kplatecarryingl said central pole piece and an iaaiiiiular pole piece having a cone form With `its .base` in' contact with the base plate, and

terminal means, substantially as set forth.

2. In a, telephone receiver, the 4combinav`tion of a housing'a diaphragm carried by isaid housing, aiiielectro-magnetic member l comprising a central pole piece, an energizcoil surrounding said pole piece, a base plateA carrying said central pole piece and "an annularpole piece having a cone form 2o and 'provrded with a. marginal contact iange,

said flange having connection with said base plate, and terminal means, substantially as set forth v 3. ln a telephone receiver, the combina- 25 tion offa housing, a diaphragm carried by said. housing, an electro-magnetic member comprising a central pole piece, an energizing. coil surrounding said pole piece, a base 'plate carrying said central pole piece and 3U having a marginal recess,.anrannular pole piece having a cone form and yprovided with a 'marginal contact flange, and terminal Y ine'aiis substantially as described.

Lin'lln a'telephone receiver, the combination of a housing,a diaphragm carried by said'liousing, an electro-magnetic member comprising a central'pole piece, an energizing,l coil v.surrounding said pole piece, a base plate carrying said central pole piece and an 40 annular pole piece having a cone form and provided With a marginal Acontact Harige having a recess in its circumference said .Jliange having.connection with said base,

plate, and terminal means, substantially as t5 set forth.

5. ln a telephone receiver, the combination of a housing, a diaphragm carried byl said housing, an electro-magnetic member comprising a central pole piece, an energizing coil surroundingsaid pole piece, an 4ain-v nular pole piece having alcone-form and `provided With marginal ears, a base plate lhaving marginal ears and a central oriice A"fior connection with the central pole piece,

;-s egmental terminal plates, an interposed in sulating plate, and screws passing through said terminal plates,'insulating plate and marginal ears to secure the parts in assembled relation, substantiallyr as set forth. G50 [6. ln a telephone receiver, the combinattion of a-housing, a diaphragm carried by said housing, Van electro-magnetic member comprising a-central pole piece, an energiz- 4ing coilsurrounding said pole piece, an an- 655 nular polapiece having` ai cone vtorni. and4 provided with marginal ears and a pair of insulated bushings vin its cone shaped web, a base plate having marginal ears and a central orifice for connection with the central pole piece, segmental terminal plates, an interposed insulating plate, screws passing through said terminal plates, insulating plate-and marginal ears to secure the parts in'asseinbled relation, and connecting wires between the terininal'plates and the energizing coil passing through the insulating bushings 'of the annular pole piece, substantially as set forth.

7. In a telephone receiver, the combination of a housing having a plurality of iiiterior ledges, a diaphragm carried by said housing, an electro-niagnetic member comprising a central pole piece, a coil surroundingsaid pole piece, an annular pole piece having a cone forni and provided with marginal ears, aA base plate having' marginal ears and a central orice for connection with the central pole piece, segmental terminal plates, an interposed insulating plate,

screws passing through said terminal plates,

insulated plate and marginal ears to secure the parts inyassembled relation, and screws passing through the terminal plates andl screwing into the ledges of the housing, substantially as set forth.

8. ln a. telephone receiver, the combination of a housing, a diaphragm carried by said housing, an electro-magnetic member lcomprising a centralpole piece, an energizing coil surrounding said pole piece and having aconical form, a bobbin carrying said coiland end rims of different diameters, an annular pole piece having a cone 'form and marginal ears, a base plate having maginal ears and a central orilice for in assembled forth.

said housing, an electroemagnetic member comprising a central pole piece, an energizing coil surrounding` said pole piece, an annular pole piece having a cone form and provided. with marginal ears a base plate having marginal ears and a central orifice for connection with the central pole piece,

a pair of terminal plates one ofwvhich is Jformed in two sections a sivinrino semi- -circular switch member having constant contact withv one of said sections and adapted to be moved into contact with the other of said sections, an interposed` insulating plate, and means for ,attaching the parts relation, substantially `as set 10. -lln a' telephone-:received the combinaassembled relation,

tion of a housing, a diaphragm carried by said housing, an electro-magnetic ni-ember comprising a central pole piece, an energizing coil surrounding said pole piece, an annular pole piece having a cone form and provided with marginal ears, a base plate having marginal ears and a central orifice for connection with the central pole piece, a pair of terminal plates one of which is formed in two sections, a swinging semicircular switch member having constant Contact With one of said sections and adapted to be moved into contact with the other of said sections, an interposed insulating plate, and means for securing the parts in one of said terminal plate sections having a barrier projection disposed in the path of the switch member, substantially as set forth.

ll. n a telephone receiver, the combination of a housing', a diaphragm carried by said housing, an electro-1nagnetic member comprising a central pole piece having an intermediate screw-threaded portion and an operating handle at one end, an energizing coil surrounding said. pole piece, an annular pole piece, a base plate connecting said pole pieces and having a central screw-threaded orifice for the adjustable engagement of the. screw-threaded portion of the central pole piece, and means for securing the base plate to the annular pole piece, substantially as set forth.

12. ln a telephone receiver, the combination of a housing, a diaphragm carried by said housing, an electro-magnetic member comprising a central pole piece having an intermediate screw-threaded portion and an operating handle at one end, said handle having a peripherallj,7 grooved collar for holding engagement with a head band, an energizing coil surrounding said central pole piece, an annular pole piece, a base compri-sing a central pole piece. an energiz- .said housing,

plate connecting said pole pieces and l a ving a central screw-threaded orifice 'for the adjustable engagement of the screw-ihreaded portion of the central pole piece, and meansl for securing the base plate to the annular pole piece, substantiall)7 as set i'orth.

lf3. ln a` telephone receiver, the combination o't' a housing, a diaphragm carried ln' said housing, an electro-magnetic member ing coil surrounding said pole piece. an annular pole piece having a cone form and provided with marginal ears, a base plate having marginal ears and a central orifice for connection with the central pole piece.

.segmental terminal plates having tubular enlargements at their adjacent ends l'or the reception of terminal pins of the lim` wires. an interposed insulating plate. and means for securing the p'arts together in assembled relation, substantially as set forth.

14. n a telephone receiver, the combination of a housing, a diaphragm carried h v an electro-magnctie member comprising a central pole piece having an intermediate screw-tlnezulcd portion and an operating handle at one end. :in energizingcoil surrounding said pole piece. an annular pole piece, a base plate connecting said pole pieces and having a central screwthreaded orifice for the adjustable engage ment of the screw-threadcd portion ot' the central pole piece, means for securing' the base plate to the annular pole piece. and a coiled springinterposed betn'eei'i the base plate and the operating handle oi' the'crn tral pole piece. sulnstantially as .set tin-th. Signed at Chicago, illinois, this th dav of February, 1915,

l llilivliii il llrl.

Witnesses lim L. CRANE. HUBERT BURNS, 

